Re-Os Dating of Molybdenite from the Maoduan Lead-Zinc Polymetallic Deposit in Southwestern Zhejiang Province and Its Geological Significance
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摘要: 毛断铅锌多金属矿床位于浙西南江山-绍兴断裂和政和-大埔断裂间的隆起区，为区内代表性的铅锌多金属矿床之一.应用Re-Os同位素定年方法对该矿床5件辉钼矿样品进行了成矿时代测定，获得辉钼矿Re-Os同位素模式年龄为(138.6±2.0)Ma~(140.0±1.9)Ma，等时线年龄为137.7±2.7 Ma(MSWD=0.7)，模式年龄加权平均值为139.0±0.8 Ma(MSWD=0.5).该年龄与毛断隐伏岩体成岩时代相吻合，表明成矿与成岩关系密切.辉钼矿Re-Os年龄的精确厘定，表明毛断铅锌多金属矿床为早白垩世初期华南岩石圈伸展背景下的产物.同时结合前人同时代的W、Mo、Pb、Zn等矿床的研究成果指出140±7 Ma可能为华南另一重要的成矿时限.Abstract: The Maoduan lead-zinc polymetallic deposit, located in uplift area between the Jiangshan-Shaoxing and Zhenghe-Dabu deep faults in southwestern Zhejiang Province, is one of typical lead-zinc polymetallic deposits in this region. Re-Os dating of 5 molybdenite separated from the Maoduan lead-zinc polymetallic deposit gave model ages from 138.6±2.0 Ma to 140.0±1.9 Ma. These data yielded an isochron age of 137.7±2.7 Ma with MSWD=0.7, and a weighted average model age of 139.0±0.8 Ma (MSWD=0.5). This result is in good agreement with the Maoduan concealed monzogranite, indicating that Pb-Zn polymetal mineralization was related to granite crystallization. According to the precise Re-Os ages we have reported and previous studies, we interpret the Maoduan Pb-Zn deposit formed in an extensional setting related to lithospheric extension during the Early Cretaceous in South China. Meanwhile, we also point out that 140±7 Ma may be another important time range of tungsten-molybdenite-lead-zinc polymetallic mineralization in South China.
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图 1 浙西南大地构造位置简图(a)、地质简图(b)及毛断铅锌多金属矿床地质图(c)(a、b、c分别据王强等(2005)、李春忠和吕新前(2006)、浙江省地质调查(2005)浙江遂昌-庆元地区金银铅锌多金属矿调查评价成果报告修改)
1.第四系；2.早侏罗世枫坪组；3.古元古代八都群大岩山组；4.古元古代八都群泗源组第五岩性段；5.古元古代八都群泗源组第四岩性段；6.古元古代八都群泗源组第三岩性段；7.古元古代八都群泗源组第二岩性段；8.古元古代八都群泗源组第一岩性段；9.二长花岗(斑)岩；10.霏细斑岩脉；11.闪长玢岩脉；12.矿化带；13.矿(化)体及编号；14.Mo异常等值线(10-6)；15.断层；16.不整合界线
Fig. 1. Sketch maps showing tectonic location of southwestern Zhejiang Province (a), simplified geological map of southwestern Zhejiang Province (b), and geological map of the Maoduan lead-zinc polymetallic deposit (c)
图 2 毛断铅锌多金属矿床辉钼矿Re-Os同位素模式年龄加权平均(a)及等时线年龄图解(b)
Fig. 2. Re-Os weighted average model ages (a) and isochron age (b) of molybdenite from the Maoduan lead-zinc polymetallic deposit
表 1 实验全流程空白水平及标准物质HLP测定值
Table 1. Certificated values of Re-Os isotope for total procedure blank value and standard sample HLP
样号 Re Os普(10-9) 187Os(10-9) 模式年龄(Ma) 测定值 2σ 测定值 2σ 测定值 2σ 测定值 2σ 全流程空白水平 081006-19 0.025 2 0.001 0.000 1 0.000 0 0.000 1 0.000 0 081111-24 0.041 1 0.007 0.000 3 0.000 0 0.000 2 0.000 1 标准物质测定值 GBW04435 279.7 2.5 649.2 5.8 221.2 3.3 GBW04435 283.6 2.4 654.0 6.4 219.8 3.3 推荐值 GBW04435 283.8 6.2 659.0 14 221.4 5.6 注：全流程空白水平Re含量单位为10-9；标准物质测定值和推荐值Re含量单位为10-6. 
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表 2 浙西南毛断铅锌多金属矿床辉钼矿Re-Os同位素组成
Table 2. Re-Os isotopic compositions of molybdenites from the Maoduan lead-zinc polymetallic deposit, southwestern Zhejiang Province
编号 样号 样重(g) Re(10-9) Os普(10-9) 187Re(10-9) 187Os(10-9) 模式年龄(Ma) 081119-19 Mo-2 0.150 28 3 093±24 0.000 2±0.000 0 1 944±15 4.582±0.041 139.6±2.0 081125-7 Mo-6 0.150 33 3 498±28 0.001 3±0.002 8 2 199±17 5.135±0.041 140.0±1.9 081029-10 Mo-4-2 0.050 02 4 118±33 0.000 9±0.000 7 2 589±21 5.963±0.054 138.1±2.0 081119-20 Mo-3 0.150 36 3 570±31 0.000 0±0.000 0 2 244±19 5.190±0.045 138.7±2.0 081119-21 Mo-4 0.150 58 4 001±35 0.000 1±0.000 0 2 515±22 5.814±0.049 138.6±2.0 081119-22 Mo-5 0.150 22 7 856±59 0.000 1±0.000 0 4 938±37 11.420±0.100 138.7±2.0 注：测试者为中国地质科学院国家地质测试中心屈文俊、曾法刚.表内误差为2σ.
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表 3 华南晚侏罗世末期-早白垩世初期成矿事件统计
Table 3. Mineralization ages of ore deposits from the end of Late Jurassic to Early Cretaceous in South China
矿床 测试对象 测试方法 成矿时代(Ma) 资料来源 地区 铜坑嶂钼矿床 辉钼矿 Re-Os等时线 133.8±0.65 许建祥等，2007 南武夷 金竹坪钼铅锌多金属矿床 辉钼矿 Re-Os等时线 135.5±5.7 张家菁等，2009a 北武夷 行洛坑外围石英脉型钨矿床 石英 流体包裹体
Rb-Sr等时线147.5±2.9 张家菁等，2008 中武夷 锯板坑钨锡多金属矿床 蚀变绢云母 Ar-Ar P: 139.2±1.5
L: 143.6±3.9付建明等，2009 南岭 茅坪石英脉型钨锡矿床 辉钼矿 Re-Os模式年龄 141.4±2.2 曾载淋等，2009 八仙脑钨多金属矿床 133-147 曾载淋等，2009 大吉山钨矿床 蚀变绢云母 Ar-Ar L: 144.0±0.7
L: 146.9±1.1张文兰等, 2006 治岭头铅锌金多金属矿床 石英 流体包裹体
Rb-Sr等时线139.7±3.9 陈好寿和徐步台, 1996 浙西南 毛断铅锌多金属矿床 辉钼矿 Re-Os模式年龄
加权平均139.0±0.8 本文 注：P为Ar/Ar坪年龄；L为Ar/Ar等时线年龄.
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